| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive optical device capable of imaging an omnidirectional image in the direction substantially orthogonally crossing with a central axis on an imaging device in a simple constitution, and being a small type having less strain in image and favorable F-θ characteristics; to provide an optical system with the same; and to provide an endoscope using the same. SOLUTION: The optical device consists of a transparent medium L1 being rotation symmetry about the central axis 2 and having a refraction index larger than 1, wherein the transparent medium L1 has a first transmission face 11, a first reflecting surface 12, a second reflecting surface 13 disposed in the opposite side of an image plane 5 relative to the first reflecting surface 12, and a second transmission face 14 disposed closer to the image plane 5 than the second reflecting surface 13. This optical device is characterized in that an optical flux entering the transparent medium L1 passes the transparent medium L1 via the first transmission face 11 in the order of tracing a normal light, is reflected by the first reflecting face 12 to the opposite side to the image plane 5, reflected by the second reflecting face 13 to the side of the image plane 5 and outgoes from the transparent medium L1 to the side of image plane 5 via the second transmission face 14 to constitute a substantially Z-shaped optical path A. COPYRIGHT: (C)2009,JPO&INPIT
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